56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
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---
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id: 5900f5061000cf542c510017
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challengeType: 5
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title: 'Problem 409: Nim Extreme'
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videoUrl: ''
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localeTitle: 问题409：Nim Extreme
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---
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## Description
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<section id="description">设n是正整数。考虑nim位置：有n个非空桩。每堆的尺寸小于2n。没有两个桩具有相同的尺寸。设W（n）是满足上述条件的获胜nim位置的数量（如果第一个玩家具有获胜策略，则获胜的位置）。例如，W（1）= 1，W（2）= 6，W（3）= 168，W（5）= 19764360，W（100）mod 1 000 000 007 = 384777056。 <p>求W（10 000 000）mod 1 000 000 007。 </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler409()</code>应该返回253223948。
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testString: 'assert.strictEqual(euler409(), 253223948, "<code>euler409()</code> should return 253223948.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler409() {
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// Good luck!
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return true;
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}
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euler409();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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